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Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and other remote controls use radio waves - Edexcel - GCSE Physics - Question 8 - 2019 - Paper 1
Question 8
Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and other rem... show full transcript
Worked Solution & Example Answer:Which colour of visible light has the longest wavelength? A blue B green C red D yellow (b) Some television remote controls use infrared radiation and other remote controls use radio waves - Edexcel - GCSE Physics - Question 8 - 2019 - Paper 1
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Explain why an infrared remote control may not switch on the television from behind an armchair but a radio wave remote control always will.
Answer
Infrared remote controls work by emitting infrared radiation, which requires a direct line of sight to the television. If the remote control is obstructed by an object, such as an armchair, the infrared signals cannot reach the television, preventing it from responding. Conversely, radio wave remote controls use radio waves that can penetrate obstacles. This means they can operate the television from behind objects without requiring direct line of sight, allowing them to always work regardless of physical barriers.